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Derivative Instruments - Summary of Notional for VIE Derivatives Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative products, Notional Amount	$ 2,776,103	$ 11,281,777
Derivative products, Notional Amount	94,322	213,585
Successor Ambac [Member]
Derivative [Line Items]
Derivative products, Notional Amount	2,776,103
Successor Ambac [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative products, Notional Amount	1,818,118
Successor Ambac [Member] | Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member]
Derivative [Line Items]
Derivative products, Notional Amount	3,350,714
Successor Ambac [Member] | Currency Swaps [Member]
Derivative [Line Items]
Derivative products, Notional Amount	770,319
Successor Ambac [Member] | Credit Derivatives [Member]
Derivative [Line Items]
Derivative products, Notional Amount	20,130
Predecessor Ambac [Member]
Derivative [Line Items]
Derivative products, Notional Amount		11,281,777
Predecessor Ambac [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative products, Notional Amount		1,782,999
Predecessor Ambac [Member] | Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member]
Derivative [Line Items]
Derivative products, Notional Amount		4,707,454
Predecessor Ambac [Member] | Currency Swaps [Member]
Derivative [Line Items]
Derivative products, Notional Amount		755,438
Predecessor Ambac [Member] | Credit Derivatives [Member]
Derivative [Line Items]
Derivative products, Notional Amount		$ 20,885

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration